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Engine-Codes – GMC – U1816 GMC

U1816 GMC Code - Lost Communication With Drive Motor Control Module B On Bus B

Quick Answer

The U1816 GMC code indicates that there is a communication issue between the vehicle's onboard computer system and the Drive Motor Control Module B on Bus B. Common causes include Faulty wiring or connectors, Corrosion in the electrical connections, Damaged Drive Motor Control Module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
U1816 GMC indicates Lost Communication With Drive Motor Control Module B On Bus B.
Common causes
Common causes include Faulty wiring or connectors, Corrosion in the electrical connections, Damaged Drive Motor Control Module.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 14, 2024
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Code U1816 GMC Description

The U1816 GMC code indicates that there is a communication issue between the vehicle's onboard computer system and the Drive Motor Control Module B on Bus B. The Drive Motor Control Module is responsible for controlling the electric drive motor in hybrid or electric vehicles. When communication is lost with this module, it can lead to a variety of performance issues and potentially affect the drivability of the vehicle.

OBDII Code U1816 GMC - Lost Communication With Drive Motor Control Module B On Bus B
U1816 GMC Code - Lost Communication With Drive Motor Control Module B On Bus B

Common Causes of U1816 GMC

  1. Faulty wiring or connectors
  2. Corrosion in the electrical connections
  3. Damaged Drive Motor Control Module
  4. Software issues in the vehicle's computer system
  5. Electrical interference from other components or systems

Symptoms of U1816 GMC

  1. Loss of power
  2. Decreased fuel efficiency
  3. Rough idling
  4. Stalling
  5. Dashboard warning lights (e.g., check engine light, hybrid system warning light)

How to Fix U1816 GMC

  1. Begin by conducting a thorough inspection of the wiring and connectors associated with the Drive Motor Control Module B on Bus B.
  2. Check for any signs of damage, corrosion, or loose connections, and repair or replace as needed.
  3. If the wiring and connectors are in good condition, proceed to test the Drive Motor Control Module itself for any malfunctions.
  4. If the module is found to be faulty, replace it with a new or refurbished unit.
  5. After completing the repairs, clear the diagnostic trouble codes from the vehicle's computer system and test drive the vehicle to ensure that the issue has been resolved.

Cost to Fix U1816 GMC

The typical repair costs for addressing a U1816 GMC code can vary depending on the specific cause of the communication issue and the extent of the repairs needed. In general, the cost of parts for replacing a Drive Motor Control Module can range from $300 to $800, while labor costs can add an additional $100 to $200. Overall, the total repair costs for this issue may range from $400 to $1000. It's important to note that these are rough estimates, and actual costs can vary based on factors such as location, vehicle make and model, and the rates of the auto repair shop. It's recommended to obtain quotes from local repair shops for a more accurate cost estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U1816 GMC Code

1. What are the common symptoms of OBDII code U1816 GMC?

Common symptoms include the Check Engine Light coming on, poor vehicle performance, issues with acceleration, and potential difficulty shifting gears.

2. What does the OBDII code U1816 GMC indicate?

U1816 indicates a communication problem between the vehicle's onboard computer and the Drive Motor Control Module B on Bus B.

3. What are some possible causes of the U1816 GMC code?

Possible causes include damaged wiring or connectors, a faulty Drive Motor Control Module, software issues, or a malfunctioning CAN bus communication system.

4. How can I diagnose the U1816 GMC code?

Diagnosing this code typically involves using a professional OBDII scanner to retrieve the specific details of the code and checking the wiring and connectors associated with the Drive Motor Control Module B on Bus B.

5. How can I repair the U1816 GMC code?

Repairing this code may involve fixing any damaged wiring or connectors, replacing the Drive Motor Control Module if necessary, updating software, or addressing any issues with the CAN bus communication system.

6. Can I drive my vehicle with the U1816 GMC code?

It is generally not recommended to drive the vehicle with this code present, as it can affect performance and potentially lead to further damage if left unresolved.

7. Will resetting the Check Engine Light fix the U1816 GMC code?

Simply resetting the Check Engine Light may temporarily clear the code, but it will likely reappear if the underlying issue causing the communication problem is not addressed.

8. How much does it cost to fix the U1816 GMC code?

The cost of fixing this code can vary depending on the specific cause of the communication problem. It is recommended to consult a professional mechanic for an accurate diagnosis and cost estimate.

9. Can I fix the U1816 GMC code myself?

While some DIY enthusiasts may be able to address simpler causes like loose connectors, diagnosing and repairing more complex issues associated with this code may require professional expertise.

10. How can I prevent the U1816 GMC code from recurring?

Regular maintenance and timely addressing of any related issues, such as damaged wiring or connectivity problems, can help prevent the U1816 code from recurring in the future.

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